Law of conservation of mass

6 June 2016

Problem: To validate the law of conservation of mass and to examine what happens when one Alka- Seltzer tablet is combined with water. Hypothesis: If the Alka-Seltzer tablet is combined with water, then Co2 will be produced because when mixing the two compounds, a chemical reaction will occur. Materials:

Procedure: 1.Mass the Alka-Seltzer tablet then put the flask on the scale to record the mass, and zero the scale. 2.Add 50 mL of water to the flask and record the mass. Subtract the mass of the flask from the mass of the water in the flask to find the total mass of the water. Next mass the balloon. Add together the mass of the water and tablet 3.Break the Alka-Seltzer tablet over the massing tray, then using the forceps pick up both pieces of tablet. When dropping the tablet into the flask have your partner place the balloon over the opening of the flask at the same time. 4.Wait until fizzing/ bubbling subsides (aprox. 20 minutes) then mass the flask with balloon on top. From this subtract the mass of the flask and balloon from the total mass of the flask, water, tablet and balloon combined. By doing this, the number that is left should be approximately the same mass as when the experiment began.

Law of conservation of mass Essay Example

Conclusion: The purpose of this experiment was to validate the law of conservation of mass and to examine what will happen as a result of dropping one Alka-seltzer tablet into 50mL of water. First, all of the materials were measured and massed separately then the water and Alka-seltzer tablet were added together to find the mass of the reactants.

The total mass of the reactants was 50.81g. Once all the materials were measured and prepped for the experiment the experiment was performed. In order to fit the Alka-seltzer tablet into the flask it needed to be cut in half since the opening to the flask was smaller than the tablet. Immediately after the tablet was dropped into the flask containing water, a balloon was stretched over the opening of the flask, capturing all or most of the gas produced.

It was observed that once the tablet was dropped into the water and the balloon covered the top of the flask that there was a small fizzing/ hissing noise coming from the reaction and there was a plethora of small carbon filled bubbles being produced. After about two minutes into the experiment, the fizzing noise subsided but the bubbles continued.

The amount of bubbles slowly decreased in number until about twenty minutes into observing the reaction did the bubbles finally stop. Once the bubbles subsided the flask containing water and the Alka-seltzer tablet with the balloon on top was massed, the total mass of this was 146.62 grams. After massing that, the mass of the balloon (2.98g) and flask (93.20g) was subtracted from 146.62 grams thus equaling the total mass of the products, 50.44g that is only 0.37grams off from the total mass of the reactants.

There were elements that made this lab invalid. One thing that can make results more trust worthy is that not multiple trials were performed. Performing multiple trails ensures that results are more accurate and precise. Another element that made this lab experiment invalid happened when the Alka-seltzer tablet was broken in half. Even though the breaking of the tablet was done on a massing tray there were still crumbs from the tablet that fell off and did not make it into the flask.

This made the final mass of the products less than the mass of the reactants. The last element that made this lab invalid was as the tablet was placed into the water. As soon as the Alka-seltzer tablet and the water made contact a reaction occurred producing gas, the balloon covered the opening of the flask right after, but still after the gas began to be produced. This caused some gas not to be captured inside the balloon thus escaping. The result of this event happening caused a small amount of mass to be lost. This impaired out results of the mass of the products because not all the mass that was present in the reaction was accounted for.

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